How to choose an oil testing laboratory?

Mainly there are three aspects when we purchase anything: price, service, and quality. But you can have two of them, in any business but not all three at the same time.
Hiring an external oil testing laboratory is a strategic decision. Mostly, like many other business decisions, price is (wrongly) the overall decider. There are numerous aspects of the oil testing service that need to be considered: interpretation skills, tests available, turnaround time, and, yes, price.